Pointer Program #3

12. Swap two numbers using user defined function. (Use concept of Call by Reference). 

#include<stdio.h>
void swap(int *,int *);
void main()
{
     int x,y;
     printf("Enter the values of first number:\n");
     scanf("%d",&x);
     printf("Enter the values of second number:\n");
     scanf("%d",&y);
     swap(&x,&y);
     printf("\nValues inside the main function:");
     printf("\nfirst=%d,second=%d\n",x,y);
}
void swap(int *a,int *b)
{
     int t;
     t=*a;
     *a=*b;
     *b=t;
     printf("\nValues inside the swap function:");
     printf("\nfirst=%d,second=%d",*a,*b);
}

Output

• Enter the values of first number:
  3
  Enter the values of second number:
  5
  
  Values inside the swap function:
  first=5,second=3
  Values inside the main function:
  first=5,second=3

Note: 

Call by reference

• In call by reference, the address of actual parameters are passed as an argument to the called function.
• So the original content of the calling function can be changed.
• Call by reference is used whenever we want to change the value of local variables through function.

 

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